Как добавить редактор текста?

INSTALLED_APPS = (
    # ...
    'simplemde',
    # ...
)

from django.db import models
from simplemde.fields import SimpleMDEField

class Entry(models.Model):
    title = models.CharField(max_length=250, verbose_name=u'Title')
    content = SimpleMDEField(verbose_name=u'mardown content')